When does HOT (Hold Over Time) begin for the crew to apply deicing fluid?

When does HOT (Hold Over Time) begin for the crew to apply deicing fluid?

• A. At the start of the deicing process
• B. After the aircraft is completely deiced
• C. With the start of the final application step
• D. Immediately upon arrival at the aircraft

Answer: (C)

Hot Hold Over Time (HOT) is a critical consideration in de-icing practices as it helps ensure that the de-icing fluid remains effective for a specified duration after application. The correct understanding is that HOT begins with the start of the final application step. This timing is important because it is at this final stage that the de-icing fluid reaches its optimal coverage and effectiveness on the aircraft’s surfaces. Once the last application is completed, the protection against ice or snow accumulation starts to count down based on the specific effectiveness of the fluid used and the environmental conditions. In contrast, starting HOT at other points, such as when the de-icing process begins or when the aircraft is completely deiced, would not accurately reflect the effectiveness of the fluid post-application. The timing is crucial for flight safety, as it informs the crew about the remaining time before the protective qualities of the de-icing fluid may diminish. Thus, understanding that HOT is measured from that final application step is essential in managing de-icing procedures properly.

Hot Hold Over Time (HOT) is a critical consideration in de-icing practices as it helps ensure that the de-icing fluid remains effective for a specified duration after application. The correct understanding is that HOT begins with the start of the final application step.

This timing is important because it is at this final stage that the de-icing fluid reaches its optimal coverage and effectiveness on the aircraft’s surfaces. Once the last application is completed, the protection against ice or snow accumulation starts to count down based on the specific effectiveness of the fluid used and the environmental conditions.

In contrast, starting HOT at other points, such as when the de-icing process begins or when the aircraft is completely deiced, would not accurately reflect the effectiveness of the fluid post-application. The timing is crucial for flight safety, as it informs the crew about the remaining time before the protective qualities of the de-icing fluid may diminish. Thus, understanding that HOT is measured from that final application step is essential in managing de-icing procedures properly.